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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd411261da7b4ba145230cd65bf363100af76ed076c7f0a805fdea8b8a44eccf5' 
  AND token = 'wxf0AO7J1HuM6ZsvP42kqlTvAHHkLmYNyQkpf3PPNcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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