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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b790843b1b2565106bb222300f378ee26c59eee32b563265c498eb9150ea6d4' 
  AND token = 'c8gZNtcqp0MG3BOS+ayse7G2Hb/61sg1eF3BNTh7+PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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