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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa8fa43f3c6d10d1b32cc211818b8c715cfa9e85ab5a6d21e4765d705faae30' 
  AND token = 'l8gCQ8wfxW7yjdPVSsYrbTOpz8EqO6yJ6DiD95yKEGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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