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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f9eee60d3c8766ba6b82c77a33d78eb9696bcc1c1002f1a01bd655ab72dc3c' 
  AND token = '/yCFbD9gJwRXb6TZLmxB6J94cWDKBAJfOi6NPO/8efY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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