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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d16a5feae0aaaef703d8aa0e797e8c8b08bed476f1be149b9b55df85ecf7a5' 
  AND token = '1Smd5Tj/cjZcLR5XS6Dd4yIi+i/vbRzjT5Neo69dp/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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