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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b29916a8c75561d46406942d9809f82af3525d795d73524c6317453535086a8' 
  AND token = '2B+ryHp4ZQST7km/fdOIO04VCDddv8XIBuoi8ZxU6J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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