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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ee36893e55c4988a4ef24dbcaa5c90b6d33c1c468bb3c680a29ad3883aa592' 
  AND token = 'VB4AKFPtyqJfZ6qxLjWn+pyDtv0loTeReqP1L55eZug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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