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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eeb57a25dbffdf1dc07188c26efcf8e4ba4f314302ca39c4b6a7fefd3b01691' 
  AND token = 'IDMT4m8WRb6uDGXADr12cfhnoGfDRQbpmhWDW7aYQ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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