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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c9d6a03149a71951f1cc74a026d87a6de6ed323375f44596a98acc9ae5cc6d' 
  AND token = '6PDEUXJ9/gRUzast6j3SF96ywsn93XJpOrydXdsyGVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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