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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83439d34fbb7f4bd5bce54d809f0aa7da07922d14ca22e92756f8406a0e6445b' 
  AND token = 'khf9DD4t+5lrU7DX7WwxBGXP6c7K93Ww7VZ5y+2dNG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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