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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0e47388be8b785720576a59ea09ce1e27cac35b4f6a546b66a68548e031eb1' 
  AND token = 'ruDeNCX4twawvLI9YTNZTcBQ1nX4UafUFQCt2cI+er0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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