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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d058c6e793ae5e41e21a33091a3694208ac88260bda9bb51835fbe0c1d21739' 
  AND token = 'D0ys1AXHuowojlyouMkVmmk0GkmcuJ+bXgQhXR9dRS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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