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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeeec2ae81427415a30a9845409e6f57fe73854e74c9e3e2f83bb744b3befa15' 
  AND token = 'dEW55CC61JQEYrCUrt3WVLQ9hwmj0MMEQ71sDPwC+Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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