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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fcbff460c5c1236c33cfc29ff0978c5012194781945411a2bcaf0c540a8433' 
  AND token = 'XOZYSxFKOmmp5I3snRGooBnHtoaAujofIX06MTylrVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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