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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0821d4bbba232df031c83c2572a63316d58c46bfca109b19beda40468ccdb7a1' 
  AND token = 'toyfvC1srvAybFeSpLlnbxNQfAy3SWS5drM3fXvh8U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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