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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641df219480b2d26cdf83e5d302a812d0941fffede46a3df923b8e6b63ee5e08' 
  AND token = '9WtEBarUfHSpfXEd8Xr9Q1iBJCciSaLy7Fyi+5xFpBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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