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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a276e0a54c30b2198e3ae64ee06c5c1dd437a75c6351d36b14824af16c02d4e' 
  AND token = '2hsGZwK+fracQ4L3OC024RYOjWnN3qC1XUcT+1Y+v+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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