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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4bcbfa1651f0653c248b8321b8ae619f8d76f32513fb4ea3e18460ca5a8888' 
  AND token = 'vID7G0eQ3/1K5bQhV9QA29/ILSRnChAzimXaBMN4K8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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