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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ae9ec605dcbdb5eb62848ccf3816137cf5d7372071aa8b96c4e8cb3fe1b77c' 
  AND token = 'MDqEZTKRl/9I9yp1+YeYnfKwmJz4qiNkn2M6mFXp9pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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