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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8452c538a7e2786276cf3533f13bc75885e53e0278714210342b7b5a78b1339' 
  AND token = 'mjSTe414ovMbdF9MvForFxym9Jhm9ItnAU61hM2DA6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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