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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e92b642f15b81419c15a55c454db400934d4c8a10da3915ec5a8c763ac56e0' 
  AND token = '4X8GimZTk/cACKAKKsY7OSrIeNHHULiM1fF36OQLGsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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