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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f2ef7feb999aef8f499b59290c97a1eacaf6f5ce1da0de439fb3dda1b1de40' 
  AND token = 'SGvV7YcqB7N/cxHDzKxI3SsjPleqZei4mwJhcPEymbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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