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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de2754e142b333e56971cdc313c504e9d358b30caf1354739e9ac4c2799c489' 
  AND token = 'PvBhbghx6IzeExosHSkoEVrAAIVUKSXIFPJtVrxlr1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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