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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc54fe5ccaadd9619026f5e57be8ff0200d202d511b8d95ca4ae4b185801a63d' 
  AND token = 'NFEIcXS+Htke05iH7508WsIwHIgVUps0LY4YRaTPaEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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