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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1027149d5d0aa4e09f26a1c6612514d09b26cb7e1a4014861ac09e4f60e5b68' 
  AND token = 'xH9YNAvQQSzOAuf8OkGdx+/UfrgEHd5xpQlbd+kQlww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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