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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e972702774672229fd0a4a59975a3832cd87dd79d0ec07f70677ca6b0db36f2' 
  AND token = 'XENkgY3FYv0mke9JBAHUdkfgusSe+X+YAe8Y0p8LnYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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