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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a80ae1684e60f089d0cbdae7c7c0deba8e2abee4b543369e3700b266c7fda7' 
  AND token = 'vgopE3l3SUrvA8FyKuKwrkmuNz81RTuj/A5kOwETWWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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