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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d9d6b97f30df7d46cdde76b0efaa93485b0e6cd6c42719a8af899461773428' 
  AND token = 'obIEXpM9BnbWT97xeER2yvJusv0ovb3L8xR7wBNtLrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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