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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b96bc8048d53a36b489227c3bc71f6dbede0de457f44f745d4efc7e7f68e7b' 
  AND token = 'RyvxcOGaakGkPe8q9rPlk+lXHrzsHsSvVAWEJtt8YVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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