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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93f2edffad1b1f021eb179cf7ccc68532aa0e9c47f2a3422e4fe3b289f22f7b' 
  AND token = '3GnYfeD1EE6NV2ILHd4K5igkfC+YAuH6+Znv//gGLz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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