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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab93f312f3b8f79913c7ee5def67b1f14328a1c4f12d4d254684a6e28170b5e8' 
  AND token = 'xTVxdA9/vI3qFpdCvk5426yByD2olIHZnY08XY+2tws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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