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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9481f712a96a3ba972a896b3375256eb5a5070d4c1b664e8577a9358a9b1a93' 
  AND token = 'K4Agxi2vaK140RJu3H8X7AJvGalF78sZSVo1qIW3f1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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