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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63accb51ec113e2171c29340adb2ebb930f56b57d100553891fbda5ba4d7433f' 
  AND token = 'HGdGlCDaUy2KQABsDv62fNoirPzp/8RfGO2Bh6JL2nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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