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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc08da7ea1ef2551aca178a4c1c5b59e3c75c82da1f0f51d96e219a18b059fb' 
  AND token = '0yjSGfpahmZFln4DqojanPrZp96leJR6r72yADjfSlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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