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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ab639012609af8704f308ca00fea7f329ae67c18dda3f4a1e03be4db517c6d' 
  AND token = 'Cc9RIpnjdEmYziBUmoziwMJ0Gigrn8mW0/y1UC9UNFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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