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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5d1d9da5380cdd57f4f30e5dde5d2845a3d038eb2dfc22fa1321079a3e43a0' 
  AND token = 'CHktSPBoDnIcDETNWoJpkPDIoobDNoO1TmKn3css7Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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