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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa77aec300a27a505816f17a49e28c5cfc9400521471c003c03007da55968baa' 
  AND token = '4+i4aQ3q2iIGNJ63zoPt2688zzEazMEQVBE9x1bb+ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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