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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9f7308c8bffd16597917e7e9fa2f2688166980a91e72e16db490907ac52480' 
  AND token = 'aqUwXKXx4Wd5TpSU0MpC/NolXXRz3E4xes/GdXG4GhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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