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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9930e0cf7ac8697fc2814c576a9473afafa3aba898dc6bbe6ec6584405019c' 
  AND token = 'D1zNQIS9G3WSesyc+96wzgzaCwnTlJj5hg1E/khZvCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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