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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1961f90780b35ef8832fd2d3f8c034ef3c440a3df23ad41a3da0f769a64fc08a' 
  AND token = '0wId9WCTezerkfGC7YbXyM+AosKL/6Ukc9pSrb2lhqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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