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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71e044356d1003363f727c2d50d06bf5661fccbe590b808bfd771ad91efd1c7' 
  AND token = 'O1ialClHI7wBCTNxNNOv4d5K3xcwEtm3O+BB/f1s4Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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