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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c20e8e381fe5becfbf47dc7c8b44e2c9aed896f8ade12cb1b62b841582ab78' 
  AND token = 'GmA6AZk5tWWPQAzWvfyplri3q03vTXx3tBJW/TiT5RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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