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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116721060d1a03aadc168ac171ea674805acfe2a2f8755f5d1e28a0be9c99e39' 
  AND token = 'XFO1a/1v2krJqHjy9vTwzqNkRe7AncAULMMKHFXB7e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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