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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f7273cc2b282c11802c84002c6783157ee561dc63e58c8baf3dae8c2d3099f' 
  AND token = 'wPFiM5rM1XjIiy+BBOX5XHK9KtigI5dbW7q4b7rBrmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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