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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc7494bde6da9e2d181720fd0c565d6076b51968392d7ca15f04eb33dcb1b23' 
  AND token = 'ZlgIPRnnd0uYy+FnZCKsAnpLFajUA28O+cZhybf2X5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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