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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9e7eabaf08feccc5e611c822bbd8df72bfa3eb7a8c7d2f54c563e190ca51aa' 
  AND token = 'g2dkBXuhJ8xzhSc2YWWmzzVB4Z3DkJOWldO5iW0fniU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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