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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b108b757a36e0978b2618e0380bc31e027ddf9be9781490e79ff558ae79f77e2' 
  AND token = 'Jb/hPjL5N/to+0nd/qwVollc5+LwhzBWyqMjjx80/yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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