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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2314c07e0c2a0c492c434d9a5fdd8559e8f51a6d18d821de01b72053d734b28' 
  AND token = 'lkKIWFzxad6n56AivYaLJRhkPaWmxb7fpb/nbd3D5vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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