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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6401bf4f5f77464a29de1d9a8434e58d0800f93316305fb3a752f3401295c1' 
  AND token = 'i3L6zXxrlTqgOrRFrO7hnb1aWUtBDa3kOggzwT8jlCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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