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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88ce5076e6028e091c897a958ed8121bac08625b85c70c98314d9dd689a6b45' 
  AND token = 's1leNn3omv+nkhCzqwVIL6CenypGdRx+iKFdoms2pp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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