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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97d84301eabe2ce94b4075539cd90ffa76dd7eaa0805748e56f780ee4aa5e29' 
  AND token = '3FhWXbGHEBNnyhTrP8RAxiN/LFL3w9SKoHd4N62KE6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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