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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cae7214d43bf8cf979a136151bb5b587d31ed1c783aa6b6b61063c12ced664f' 
  AND token = '/hJ3/SJqDOmqLkKaRhB1iIwkBGD6p3iah4oxp3HkWms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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