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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23b206e97b192976a4a695df51e05e5fea23252832d5e55c8c898bb6b708edb' 
  AND token = '5ocs7d+EK9UdyyExLt9sUjUofcqcJJ80+8JOFli4uS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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