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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f76ad0e67ff9bcfa06a0a197a6b80c3246c7007472f0f1dfbd3649b34ed3ff' 
  AND token = 'P4KVXxDWQELJxmkHHoJNR7Sy7W8WC+o+/tjsXtsRxqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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