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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1641e2fdfe325f8fc87e91d1c3696044eb3051f9381d0517c6a839e35c80bba' 
  AND token = '1kVvIcbiZGmJ9tPp13WGpV78dECjbCsCz+ynel4QR1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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