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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a024f35d9d59d18fba668716d2c028d9479a1ddaf6792f06a5793b7230a88ec9' 
  AND token = 'xwAW2P3HJEVl2Tso/MmcXQS1XgkW5Vffd5ra4TE1Fp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}