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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24651a534c3e19ec69624e3e95f2d8fa0c8ede31082bf66ec747f4ae312b7e2' 
  AND token = 'zOTTGgk1R4C8+RyuXMQjiXCXyqurrb3oUaQqxMXdPfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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