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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777d03674a0a5689d43558b819845768056cd218c91418f75fd3b0c617318f77' 
  AND token = 'ekJOQZftamJRA9fjplD649+1MOL7uDbAYiEtZ7rpdak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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